Unit 4B Vocab

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Across
  1. 2. A horizontal row in the periodic table.
  2. 5. Makes up most of the periodic table.
  3. 7. The distance from an atom's nucleus to the outermost electron shell.
Down
  1. 1. Far right on the periodic table.
  2. 3. An atom (or group of atoms) with a positive charge.
  3. 4. A vertical column in the periodic table.
  4. 6. An atom (or group of atoms) with a negative charge.